hwnd (HWND) - input

      Handle of window whose update region is to be queried.

    hrgn (HRGN) - input

      Handle of the window's update region.

      The window's update region, in window coordinates, is copied into hrgn.

    lComplexity (LONG) - returns

      Complexity of resulting region/error indicator.

      RGN_NULL

        Null region
      RGN_RECT
        Rectangular region
      RGN_COMPLEX
        Complex region
      RGN_ERROR
        Error.

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